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Analog Devices Inc. LT4356HS-1#TRPBF
- Part No.:
- LT4356HS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356HS-1#TRPBF.pdf
- Description:
- IC SURGE STOPPER ADJ 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,285
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Product details
Overview
LT4356HS-1#TRPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients (e.g., automotive load dump) via external N-channel MOSFET gate control. It features 4V–80V operating range, 50mV overcurrent sense threshold, 1.25V FB reference, and –40°C to 125°C extended temperature rating in 16-pin SO package.
For engineers reviewing the LT4356HS-1#TRPBF datasheet, LT4356HS-1#TRPBF pinout, LT4356HS-1#TRPBF application, or LT4356HS-1#TRPBF equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal performance at 125°C, and real-world surge protection use cases - all grounded in Analog Devices' Rev. D datasheet and official package documentation.
Technical Context
The LT4356HS-1#TRPBF implements dual-fault protection: an overvoltage regulator loop servoing the GATE pin to maintain 1.25V at FB (clamped to 7V), and an overcurrent limiter holding ΔVSNS = VCC − VSNS at 50mV. Fault timing is dynamically scaled by VDS across the external MOSFET - current into TMR ranges from 2µA (0.5V VDS) to 50µA (75V VDS) for overvoltage, and up to 260µA for overcurrent - enabling SOA-optimized shutdown.
It integrates a shutdown input (SHDN) with –60V to 100V tolerance, a 4µA internal pull-up, and TTL-compatible thresholds (0.4V low, 2.1V high). The LT4356-1 variant disables all circuitry in shutdown (ICC < 7µA), unlike LT4356-2 which retains auxiliary amplifier operation; LT4356HS-1#TRPBF is explicitly the -1 version per ordering table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - supports cold-crank automotive (≥4V) and withstands reverse battery (−60V on VCC/SHDN). |
| Overcurrent Threshold | 50mV ΔVSNS - sets precise current limit independent of supply voltage; enables accurate sensing with standard shunts. |
| FB Reference Voltage | 1.25V (±2.5%) - defines regulated output clamp level via external resistor divider; internally clamped to 7V. |
| Shutdown Quiescent Current | <7µA - enables ultra-low-power system sleep modes without compromising fault readiness upon wake. |
| Max Junction Temperature | 125°C - guaranteed operation in under-hood automotive, industrial power rails, and high-ambient embedded systems. |
| TMR Early Warning Window | 100mV (1.25V → 1.35V) - provides fixed 20ms/µF warning interval before MOSFET turn-off, allowing host MCU backup actions. |
| Package Type | 16-Lead Plastic SO - industry-standard footprint with θJA = 100°C/W; compatible with automated assembly and thermal vias. |
Pinout & Package
LT4356HS-1#TRPBF is housed in a 16-lead plastic SO package (JEDEC MS-012AC) with exposed thermal pad not present. Pin 1 is bottom-left corner when notch is oriented left; pin numbering proceeds counterclockwise. Absolute maximum ratings include SHDN/VCC tolerance to –60V/100V and SNS tolerance to –60V relative to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TMR) | Fault timer capacitor node | Charged by VDS-scaled current during faults; 1.25V triggers FLT, 1.35V triggers GATE turn-off, 0.5V enables retry. |
| 2 (FB) | Voltage regulation feedback input | Servo point for 1.25V reference; connects to resistive divider from OUT to GND to set output clamp voltage. |
| 3 (NC) | No-connect | Internally unconnected; must be left floating or tied to GND per layout guidelines. |
| 4 (OUT) | MOSFET source sense input | Senses voltage at MOSFET source; used for EN latching and TMR current scaling based on VCC − VOUT. |
| 5 (GATE) | N-channel MOSFET gate driver output | Charge-pump-driven output clamped to VOUT + 14V; pulls up to regulate, pulls down at 150mA (OV) or 10mA (OC). |
| 6 (NC) | No-connect | Internally unconnected; must be left floating or tied to GND. |
| 7 (SNS) | Current sense input | Monitors voltage drop across sense resistor; ΔVSNS = VCC − VSNS limited to 50mV during overcurrent. |
| 8 (VCC) | Main supply input | 4V–80V operating range; withstands –60V reverse; powers internal circuitry and charge pump. |
| 9 (IN+) | Auxiliary amplifier non-inverting input | Accepts external signals up to 7V; used for UVLO, OVLO, or linear regulator control with external PNP. |
| 10 (NC) | No-connect | Internally unconnected; must be left floating or tied to GND. |
| 11 (AOUT) | Auxiliary amplifier output | Open-collector output sinking up to 2mA from 80V; drives LEDs, optos, or base of PNP pass transistor. |
| 12 (NC) | No-connect | Internally unconnected; must be left floating or tied to GND. |
| 13 (GND) | Device ground reference | Primary return path for internal amplifiers, logic, and gate drive; requires low-impedance PCB connection. |
| 14 (EN) | Enable status output | Open-collector; high-impedance when MOSFET is fully on (VOUT > VCC − 0.7V); latched until VOUT resets. |
| 15 (FLT) | Fault indicator output | Open-collector; pulls low at 1.25V TMR threshold to warn of impending shutdown; sinks up to 3mA from 80V. |
| 16 (SHDN) | Shutdown control input | TTL-compatible; pulls part into sub-7µA mode when held <0.4V; withstands –60V to 100V; internal 4µA pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic fault timer scaling | TMR current scales with VDS (2µA to 50µA for OV, up to 260µA for OC), matching MOSFET SOA and preventing overstress. |
| Reverse input protection support | Enables back-to-back N-FET configuration instead of Schottky diode, eliminating ~0.3V forward drop and reducing heat. |
| Robust shutdown interface | SHDN tolerates –60V to 100V and includes internal 4µA pull-up - eliminates need for external biasing in harsh environments. |
| Dual open-collector outputs | FLT and EN sink up to 3mA from 80V, enabling direct LED/opto coupling without level-shifting or external drivers. |
| High-temp qualified SO package | Rated for –40°C to 125°C operation with θJA = 100°C/W - validated for under-hood automotive and industrial control applications. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Rails |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS sensors during 60V/200ms load dump events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V via external MOSFET while maintaining uninterrupted operation during transient. Use Value: Prevents brownout resets and component damage without requiring oversized input capacitors or derated downstream regulators. |
Use Scenario: Safely inserting/replacing power modules in live 24V/48V factory automation backplanes without bus interruption. IC Role / Device Role / Timing Role: High-side switch controller limiting inrush and blocking reverse current during hot-plug insertion. Use Value: Enables zero-downtime maintenance and avoids arc-flash hazards using controlled MOSFET turn-on/turn-off sequencing. |
| Intrinsic Safety Barriers | Battery-Powered System Overvoltage Guard |
|
Use Scenario: Isolating hazardous-area field instruments (e.g., pressure transmitters) from safe-area power supplies in petrochemical plants. IC Role / Device Role / Timing Role: Intrinsically safe overvoltage limiter enforcing strict energy limits (<60V, <100mJ) during fault conditions. Use Value: Meets IEC 60079-11 requirements by limiting fault power dissipation and providing predictable, timed shutdown. |
Use Scenario: Shielding medical portable devices and test equipment from accidental connection to 48V PoE++ or industrial chargers. IC Role / Device Role / Timing Role: Input protector clamping output to user-defined voltage (e.g., 15V) while signaling fault via FLT pin. Use Value: Eliminates need for Zener-based crowbar circuits, reducing BOM count and improving response time to <1µs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#TRPBF | Integrated MOSFET driver + ideal diode controller; no external FET required; 4.5V–34V range; lacks adjustable clamp and dynamic TMR scaling. | Best for lower-voltage, space-constrained designs where integrated solution suffices; not suitable for 80V automotive load dump. | Select LTC4365 when board area is critical and input voltage stays below 34V; retain LT4356HS-1#TRPBF for full 80V compliance and SOA-optimized timing. |
| TPS26631PWPR | Single-chip eFuse with 4.5V–60V range, 1.2A continuous, fixed 1.2V overvoltage threshold, no adjustable clamp or auxiliary amplifier. | Targeted at USB PD and telecom power distribution; lacks programmable clamp, reverse protection support, and high-temp SO package. | Choose TPS26631 for cost-sensitive, medium-voltage eFuse needs; use LT4356HS-1#TRPBF when adjustable 27V+ clamping, –40°C to 125°C, and reverse-input capability are mandatory. |
Compared with LTC4365IMS-2#TRPBF and TPS26631PWPR, LT4356HS-1#TRPBF uniquely delivers 80V operation, user-adjustable output clamping, dynamic SOA-aware fault timing, and –40°C to 125°C qualification in a standard SO package - making it the only option for ruggedized automotive and industrial surge protection where voltage headroom and thermal reliability are non-negotiable.
Availability
LT4356HS-1#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap power rails, intrinsic safety barriers, and battery-powered system overvoltage guard applications requiring stable component supply and long-term manufacturability.
Supply support for LT4356HS-1#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets since 1965.
The LT4356 family is designed specifically for high-reliability DC power rail protection - delivering robust surge stopping, overcurrent limiting, and reverse-input resilience in harsh environments where failure is not an option.
FAQ
What is the maximum input voltage the LT4356HS-1#TRPBF can withstand without damage?
The LT4356HS-1#TRPBF supports continuous operation from 4V to 80V on VCC and SHDN pins, and is rated to withstand –60V on VCC and SHDN without damage. This makes LT4356HS-1#TRPBF suitable for automotive reverse-battery and load-dump scenarios where input may swing from –60V to +80V.
Does the LT4356HS-1#TRPBF include an internal MOSFET or require an external one?
The LT4356HS-1#TRPBF requires an external N-channel MOSFET as the pass device - it does not integrate a power transistor. Its GATE pin drives the MOSFET gate with a charge pump and clamps to VOUT + 14V, enabling efficient high-side switching with low RDS(on) FETs like IRLR2908.
How does the fault timer in LT4356HS-1#TRPBF respond to different overvoltage levels?
The LT4356HS-1#TRPBF's TMR pin current scales linearly with VDS (VCC − VOUT): from ~2µA at 0.5V to 50µA at 75V during overvoltage. This ensures shorter total fault time at higher stress - protecting the external MOSFET's SOA - unlike fixed-timer solutions that risk overstress.
Can the LT4356HS-1#TRPBF be used for reverse input protection?
Yes - LT4356HS-1#TRPBF supports reverse input protection by driving two back-to-back N-channel MOSFETs instead of a Schottky diode. Its SNS and SHDN pins tolerate –60V, and the GATE driver handles bidirectional conduction control, reducing voltage drop and power loss versus diode-based solutions.
What is the function of the AOUT and IN+ pins on the LT4356HS-1#TRPBF?
AOUT is the open-collector output of the auxiliary amplifier (sinking up to 2mA from 80V); IN+ is its non-inverting input. Together they enable configurable functions such as undervoltage lockout, overvoltage detection, or linear regulator control using an external PNP transistor - extending LT4356HS-1#TRPBF beyond basic surge protection.
LT4356HS-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT4356HS-1#TRPBF FAQ
1.How can I place an order for LT4356HS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HS-1#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT4356HS-1#TRPBF reliable?
The price and inventory of LT4356HS-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356HS-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356HS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HS-1#TRPBF?
LT4356HS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HS-1#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT4356HS-1#TRPBF?
For technical support, including LT4356HS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HS-1#TRPBF requirements.
6.How does Aetrix verify that LT4356HS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356HS-1#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT4356HS-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356HS-1#TRPBF?
All LT4356HS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HS-1#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT4356HS-1#TRPBF part is unused and in its original packaging.
Return procedure for LT4356HS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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